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| Titel: |
Influence of high rates of topdressed KCl and K2SO4 on recovery of K, Cl, and SO4-S by alfalfa and residual amount remaining in the soil |
| Auteur: |
Rominger, R. S. Smith, Dale Peterson, L. A. |
| Verschenen in: |
Communications in soil science and plant analysis |
| Paginering: | Jaargang 8 (1977) nr. 6 pagina's 489-507 |
| Jaar: |
1977 |
| Inhoud: |
This study was conducted to ascertain the percent of available K, Cl, and SO4-S recovered by alfalfa (Medicago sativa L. cv. 'Vernal') herbage when various rates of K as KCl and K2SO4 were topdressed and also to determine where residual K, Cl, and SO4-S accumulated in the soil profile. An established stand of alfalfa growing on low fertility silt loam soil was topdressed in the spring of each of two harvest years with 0, 448, 896, 1344, and 1792 kg/ha of K as KCl or K2SO4. Four harvests were taken during each harvest year (1972 and 1973). Soil samples were taken during the autumn of 1973 to a depth of 91.4 cm in KCl-fertilized plots, and to a depth of 76.2 cm in K2SO4-fertilized and control plots. Potassium recovery by alfalfa during two harvest years where K as KCl was applied at 448, 896, 1344, and 1792 kg/ha/yr was 56, 33, 20, and 17%, respectively. Recovery of available Cl from those same treatments was 30, 17, 12, and 10%, respectively. Where K as K2SO4 was applied at 448, 896, 1344, and 1792 kg/ha/yr, 55, 35, 27, and 22%, respectively, of available K was recovered. Recovery of available SO4-S from those same treatments was 16, 9, 7, and 5%, respectively. At the end of two years, a majority of the residual K was in the top 15.2 cm of soil. Residual Cl and SO4-S were concentrated at a depth of 30.5 to 76.2 cm in the soil profile. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 105 van 183 gevonden artikelen
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